Unit Testing Worker Functions

Cloudflare Workers, which allow running JavaScript in all 165+ of their data centers, have seen creative applications as use cases grow in complexity. As a result, the need to smoke test code also increases. This post demonstrates how to unit test Cloudflare Workers and their individual functions using Cloudworker, created by the Dollar Shave Club engineering team. The example script contains two functions that contribute to the response to the client. To set up the directory for testing, create a new npm project in a new directory with a worker.js file containing the script and a test folder with a worker-test.js file. Install Cloudworker and Mocha testing framework, then write tests using mocha's async/await support. This allows for more confidence when deploying complex workers as each component can be tested individually.